Dual boom drill



April 2, 1968 H. G. PYLES ETAL 3,375,880

DUAL BOOM DRILL 5 Sheets-Sheet 1 Filed June 7, 1966 April 2, 1968 H. G. PYLES ETAL DUAL BOOM DRILL Filed June 7 1966 5 Sheets-Sheet 2 5 Sheets-Sheet 3 DUAL BOOM DRILL ll'lllllfil Illlll' H. G. PYLES ETAL I'IIII l- 1 l I I IILI I I I IIITII April 2, 1968 Filed June 7, 1966 INVENTOR Y 6. p

5 Sheets-Sheet 4 April 2, 1968 H G. PYLES ETAL DUAL BOOM DRILL Filed June 7, 1966 m 1 9C w? o3 mu. mum \J Mad 3 J mw wk April 2, 1968 v H. PYLES ETAL Q 3,375,330

DUAL BOOM DRILL Filed June 7, 1966 5 Sheets-Sheet 5 INVENTOR. 1664245) 6. Pmas. ga /e45: 0. 4458/6777 United States Patent 3,375,880 DUAL BOOM DRILL Harley G. Pyles and Charles D. Albright, Fairmont,

Va., assignors to Galis Manufacturing Company, Fairmont, W. Va., a corporation of West Virginia Filed June 7, 1966, Ser. No. 555,738 Claims. (Cl. 173-37) holes in the timbers or tie members. It is believed that the roof bolts tie the overhead strata of different materials to each other and reduce horizontal shifting or sliding movement of the different strata relative to each other. With this type of roof support, it is now possible to mine and remove materials such as coal or the like according to a predetermined optimum plan.

Of greater import, however, is the improved safety afforded by supporting the overhead roof with roof bolts. The roof bolts support the rock strata forming the surface of the roof by tying exposed strata to a relatively hard and stable strata located thereabove so that the stable strata supports and holds the strata forming the exposed surface of the roof in place and minimizes the .possibility of sections of the roof falling and injuring personnel working in the mine. The transverse timbers or metallic ties used under certain roof conditions are held in place adjacent the undersurface of the roof by a plurality of roof bolts extending through predrilled holes in the timbers or metallic tie members. The ties interconnect the roof bolts and provide additional bearing support for the roof. Under relatively stable roof conditions, the

transverse ties or timbers may be omitted and roof bolts with rectangular bearing plates abutting the roof surface may be used to provide adequate and safe support for the roof.

In order to provide the desired roof support by bolting, it is necessary to first form bore holes or bolt holes to a given depth in the roof with a drill or boring tool. The depth of the bore hole may vary from several feet to ten feet or more, depending on the type of strata located above the roof. It is essential that the bore hole terminate in a strata that provides a good anchor for the expansion member on the roof bolt. Thus, the depth of the bore hole is controlled by the distance between suitable anchoring strata and the exposed roof surface.

It is often necessary to drill several bolt holes in a row transversely across the entry at given intervals to provide a standard bolt pattern. In patent application Ser. No. 254,544, entitled Portable Drill Having Straight Line Motion, filed Jan. 23, 1963, now Patent No. 3,252,525 and assigned tothe assignee of the present invention, there is described a mobile drilling machine that has a boom member extending forwardly therefrom. A horizontallinkage mechanism is provided to permit the drill head or drill pot maintained on the end of the boom to traverse a straight line perpendicular to the longitudinal axis of the drilling machine. Thus, if the drilling machine is positioned parallel to the entry, the boom, through the above-mentioned linkage, is movable linearly along a line transverse to the passageway or entry and is capable of drilling a plurality of bore holes along the line transverse 3,375,880 Patented Apr. 2, 1968 to the entry by moving the boom along and maintaining the body portion of the machine stationary.

The above-mentioned application also discloses a linkage mechanism for moving the drill mounted on the boom along a linear vertical path. With this arrangement, the bolt holes made by the drill are vertical and linear. There is also described in the above-mentioned application a means for mechanically varying the last named linkage mechanism to permit the drill mounted on the boom to move in a path at an angle and in a vertical plane. This provides a fore and aft angular adjustment for the drill steel. Thus, when the linkage mechanism is manually adjusted, it is possible with the drilling machine described in the above-mentioned patent to change the angular path of the drill from a straight line vertical path to a vertical fore or aft angular path relative to the mining machine and angular bolt holes may be drilled in the roof. The above-mentioned patent application therefore provides by means of the linkage described, an arrangement whereby a drill located at the end of a boom member may be moved in a preselected vertical plane. The drilling machine described in the above patent application is versatile and reduces substantially the time required to drill the holes in the roof bolts.

Where the bolt holes are being drilled in relatively hard materials substantial problems are encountered in aligning the drill steel with the axis of the bore hole during the drilling operation. Especially where the bolt holes are all a substantial depth. It has been found extremely diflicult to maintain the drill steel aligned with the bore hole throughout the entire drilling operation. When one drills in hard material, frequently the drill steel will penetrate the hard material and be deflected slightly or tilt relative to the vertical axis. Continued vertical drilling when the drill steel is tilted or deflected and not aligned with the bore hole causes the drill steel to rub against the sides of the bore hole, especially at a location adjacent the roof surface which is called the collar of the hole. Under certain circumstances, the rubbing of the drill steel on the collar of the hole causes the drill steel through friction to overheat and break. As is well known, this frictional rubbing can also cause a tire hazard at the mine face in gaseous mines. The rubbing of the drill steel against the sides of the bore hole also absorbs a substantial amount of the thrust energy imparted to the drill and reduces the drilling efficiency. Another problem frequently encountered during drilling is through pre-drilled holes in tie members is the angular deflection of the predrilled holes relative to a vertical plane either because of the angular relation of the predrilled holes in the tie members or because the roof surface is not horizontally planar. There is a need, therefore, for a means to rapidly adjust the linear direction or path of the drill steel to thereby maintain the drill steel in alignment with the bore hole and eliminate the above-discussed rubbing of the drill steel against the side wall of the bore hole.

Briefly, our invention is directed to a mobile drilling apparatus that includes a swing frame connected to a deck of the mobile body. A boom member is pivotally connected at the rear end portion to the swing frame and has a drill pot secured to the boom front end portion. The swing frame has a linkage mechanism which permits the swing frame and boom member to pivot in a horizontal plane while the drill pot traverses a linear path perpendicular to the longitudinalaxis of the drilling machine. A second linkage is included in the boom member to permit the drill pot to move along a linear path in a plane that includes the longitudinal axis of the boom member. The swing frame is universally connected to the mobile drilling machine and has support members connected to the front end thereof. The support members are operable to rotate to a limited extent the swing frame about its longitudinal axis. To obtain a preselected angular relation of the swing frame transverse axis with the horizontal, the support members maintain the swing frame in this preselected angular relationship to the horizontal and permit the drill pot on the end of the boom to move upwardly in a plane at an angle to the vertical and thus advance the drill in the same angular plane. There is also provided in our drilling mechanism a means to adjust the linkage associated with the boom member by moving the boom member longitudinally relative to the swing frame to angularly adjust the drill steel forwardly or rearwardly in the same plane. Thus, with our invention, it is now possible to rapidly and accurately adjust the path of the drill steel in a plane including the longitudinal axis of the swing frame and in a plane transverse to the longitudinal axi of the swing frame. Our invention also includes a pair of drill assemblies each including a swing frame and boom member mounted on the front end of the mobile body and separately controlled to permit simultaneous drilling of a pair of bolt holes in the mine roof. The pair of swing frames are so connected to the mobile body that the drill pots secured to the front ends of the boom members mounted thereon move in substantially the same linear path perpendicular to the longitudinal axis of the drilling machine. With this arrangement, the pair of drilling assemblies are operable to simultaneously drill bolt holes along a line transverse to the longitudinal axis of the mining machine.

Accordingly, the principal object of this invention is to provide a mobile drilling machine that includes means to align the drill steel with the bore hole and to adjust the path of the drill steel to align the drill steel with the bore hole.

Another object of this invention is to provide a mobile drilling machine that includes a means to adjust the linkage mechanism in the boom member to pivot the drill pot and remotely adjust the angular relationship of the drill steel in a plane including the longitudinal axis of the swing frame.

A further object of this invention is to provide a mobile drilling machine that includes means to remotely adjust the transverse path of the drill steel.

A still further object of this invention i to provide a mobile drilling machine that includes a pair of drilling assemblies pivotally connected thereto and arranged to move the pair of drill pots in the same linear path that is perpendicular to the longitudinal axis of the drilling machine.

Other objects of this invention will become apparent from the following description of the practical embodiments thereof when considered in conjunction with the accompanying drawings.

In the drawings:

FIGURE 1 is a top plan view of a portable drilling machine embodying a pair of swing frame and boom members mounted thereon.

FIGURE 2 is a view in side elevation of the mobile drilling machine illustrated in FIGURE 1.

FIGURE 3 is an enlarged top plan view of the swing frame partially fragmented and taken along the line 33 in FIGURE 2 illustrating the linkage mechanism for moving the swing frame and the boom member mounted thereon in a horizontal direction. The linkage mechanism illustrated in FIGURE 3 and the means connecting the swing frame to the deck permits the drill pot positioned on the front end of the boom member to move in a linear path that is transverse to the longitudinal axi of the drilling machine.

FIGURE 4 is an enlarged view in side elevation and partially in cross-section of the swing frame and the means connecting the swing frame to the deck of the drilling machine body portion.

FIGURE 5 is an enlarged top plan view partially fragmented, of the drill boom member and the linkage mechanism associated therewith to move the drill pot vertically.

FIGURE 6 is an enlarged vertical section taken along the line 66 in FIGURE 1 illustrating the boom memher and the linkage mechanism for raising and lowering the boom and for moving the boom member forwardly relative to the swing frame.

FIGURE 7 is a fragmentary view in section taken along the line 77 of FIGURE 4, illustrating the universal connecting means between the swing frame and the swing frame carriage.

Referring to the drawings and particularly to FIG- URES l and 2, there is illustrated a drilling machine generally designated by the reference numeral 10 that includes a mobile body or wheeled car 12 having a fiat deck 14 mounted on the front end thereof. A pair of motors 16 are mounted on the body 12 to furnish motive power for the car and to actuate a pair of hydraulic pumps 18 and a pair of vacuum pumps 20 that are suitably mounted on the body 12 behind the deck 14. The hydraulic pumps 18 and the vacuum pumps 20 are suitably connected to the motors 16. A pair of dust collectors 22 are mounted on the rear end of car 12 and are suitably connected to vacuum pumps 20 by flexible conduits (not shown).

A plurality of Z-shaped deck rails 24 and 25 are rigidly connected to the top surface of deck 14 extending from the rear end of deck 14 toward the front end thereof. Each of rails 24 and 25 is spaced from adjacent rails in parallel alignment with the longitudinal axis of the body 12, thereby forming a pair of side deck channels 26 and a middle deck channel 28 (FIGURES l and 7).

A drilling assembly, indicated generally by reference numeral 29, is movably mounted on deck 14 by means which are described more fully below. The structural details on drilling assembly 29 are shown in detail in FIGURES 3 through 7, where there is shown drilling assembly 29 comprising a swing frame indicated generally by reference numeral 30, a boom numbered 150, a swing frame carriage referred to generally by reference numeral 32, a boom carriage referred to generally by reference numeral 120, a drill pot 34 mounted on the end of boom 150 and having a drill steel 38 rotatably steel mounted therein. A drill bit 39 is secured to the end of the drill steel 38. A hydraulic motor 36 is connected to drill pot 34 and rotates the drill steel 38 and drill bit 39. Drilling assembly 29 also includes reciprocating means 116 mounted on swing frame 30 and connected to boom carriage to move the boom carriage longitudinally on the swing frame, elevating means indicated by reference numeral 160 mounted on boom carriage 120 to raise and lower boom and drill pot 34, swing means indicated generally by numeral 94 mounted on deck 14 and connected to connecting frame 76 and swing frame 30 to move swing frame 30 laterally so that the drill pot 34 moves perpendicular to the longitudinal axis of car 12, and stabilizing jacks 60 mounted on the front of swing frame 30.

FIGURES 3, 4 and 7 show in detail the construction of swing frame 30 and swing frame carriage 32. Swing frame 30 comprises a bottom member 40, a pair of spaced parallel side members 42 integral with and extending up wardly from bottom member 40, and integral at one end. with a back member 44 that is integral with and extends upwardly from bottom member 40, and a front member 45 integral with the front ends of side members 42. A first pair of vertically spaced inwardly extending guide rails 46 and 48 are connected to each side member 42 of swing frame 30 and extend inwardly therefrom, at a position approximately intermediate the front and back ends of side members 42. A second pair of vertically spaced guide rails 50 and 52 are connected to each side member 42 and extend inwardly therefrom at a position between the front of side members 42 and the first pair of guide rails 46 and 48. Guide rails 48 and 50 are removable from side member 42 and are adjustable in openings 56 and 58 extending through side member 42 to permit assembly and adjustment of boom carriage 120 on swing frame 30.

A pair of stabilizing jacks 60 are mounted on either end at the front of swing frame 30. Stabilizing jack 60 can be actuated either mechanically or hydraulically and has a base plate 62 connected by a ball joint 64 to the lower end of stabilizing jack 60 to engage forcibly the floor of a mine. In conjunction with additional structural elements that are discussed in detail below, stabilizing jacks60 can be employed to maintain swing frame 30 in a horizontal position regardless of the attitude of car 12 and regardless of the contour of the mine floor. In addition, jacks 60 can be employed to tilt and maintain swing frame 30 in a tilted position at an angle to a horizontal plane contaning the longitudinal axis of swing frame 30 regardless of the orientation of car 12 and the contour of the mine floor.

As is shown in FIGURES 3, 4 and 7, swing frame carriage 32 comprises a lower frame plate 66 having spaced parallel side members 68 depending downwardly therefrom. Each side member 68 of carriage 32 has rotatably connected thereto a pair of vertical support rollers 70, adjacent the outer surface of side member 68. A pair of horizontal guide rollers 72 are rotatably mounted on lower frame plate 66 and depend downwardly between side members 68. Swing frame carriage 32 is constructed and arranged such that support rollers 70 traverse deck channels 26 and guide rollers 72 traverse deck channel 28, thereby assuring that motion of swing frame carriage 32 is confined to a straight line parallel to the longitudinal axis of car 12. The deck rails 24 have inwardly extending portions that provide an abutment means for the rollers 70 when the stabjacks 60 exert an upwardly lifting force on the swing frame 30.

A pivot post 74 is rigidly connected to and extends vertically upwardly from, lower frame plate 66 of swing frame carriage 32. A connecting frame 76, having a base 77 with side members 79 extending upwardly therefrom is connected by means of a universal ball joint connection 78 to the upper end of pivot post 74 vertically spaced above lower frame plate 66. As is shown in FIGURES 4 and 7, the universal ball joint connection 78 between pivot post 74 and connecting frame 76 is constructed and arranged so as to permit connecting frame 76 to pivot about pivot post 74 and to tilt or revolve at least to a limited extent about the longitudinal axis of the swing frame. FIGURE 7 clearly illustrates the manner in which the swing frame 30 is connected to the connecting frame 76 and how the connecting frame pivots about the pivot post 74 through universal connecting means 78. The stabjacks 60 are individually operable so that the effective length of the stabjacks may be remotely controlled. The difference in linear dimension of the stabjacks controls the relative transverse angle of the swing frame as is illustrated by the letter A in FIGURE 7. As will be later explained, the universal ball joint connection 78 between the swing frame carriage 32 and the swing frame 30 permits adjustment of the drill steel in a plane transverse to the longitudinal axis of the swing frame 30 and transverse to the longitudinal axis of the boom 150.

Referring again to FIGURES 3, 4, and 7, a pair of spaced parallel side members 79 extend upwardly from base 77 of connecting frame 76 through slots 82 formed in the bottom member 40 of swing frame 30. Each side member 79 has a hole 84 extending through the upper end thereof and aligned with a similar hole in the opposite side member 79. A shaft 86 extends through holes 84 in side members 79 of connecting frame 76 with the ends of shaft 86 connected at 88 to side members 42 of swing frame 30.

Connecting frame 76 has a front member 90 extending downwardly from the front of base 77. The lower end of front member 90 is connected by a universal type ball joint connection 92 to swing means indicated generally by reference numeral 94 connected to the upper surface of deck 14. Ball jointconnection 92 between front member of connecting frame 76 and swing means 94 is similar in construction and operation to connection 78 between connecting frame 76 and pivot post 74 on swing frame carriage 32. Thus, front member 90 on connecting frame 76 can both pivot about connection 92 and can be tilted at least to a limited extent about connection 92 while swing means 94 remains connected to and parallel with the upper surface of deck 14. With the construction described above andshown in FIGURES 3 and 4 stabilizing jacks 60 can be operated independently to tilt swing frame .30 and connecting frame 76 as an integral structure relative to deck .14 'while swing means 94 and lower frame plate 66 of swing frame carriage 32 remain mounted on deck 14 in parallel relation therewith.

Swing means 94 comprises a hydraulically actuated swing jack 96 pivotally connected at one end '98 to deck 14 near the central longitudinal axis through bed 14 and adjacent the other drilling assembly 29. A flange 100 is integral with and extends vertically upwardly fro-m deck 14 (FIGURES -3 and 4). A lower slide plate 102 is integral with the upper end of vertical flange 100 and extends rearwardly therefrom in vertically spaced parallel relation with the upper surface of deck 14. An upper slide plate 104 is rigidly secured to the lower surface of bottom member 40 of swing frame 30, in abutting slidable relationship with lower slide plate 102. The slidable contact between slide plates 102 and 104 permits lateral swinging motion of swing frame 30 relative to deck 14 while providing continuous support for swing frame 30.

A swing lever mounting plate 106 is rigidly secured to flange 100 and has a tongue 108 extending through flange 100 into the space between lower slide plate 102 and deck 14. A swing lever 110 is pivotally connected at one end 112 to tongue 108 of mounting plate 106. Swing lever 110 projects rearwardly from its connection to mounting plate 106 in a direction opposite to the direction of forward motion of swing frame carriage 32 and swing frame 30. The opposite end of swing lever 110 is connected to front portion 90 of connecting frame 76, as explained above. Swing jack 96 extends from its pivotal connection 98 to deck 14 under swing frame 30 to a pivotal connection 114 with swing lever 110 intermediate the ends of swing lever 110.

When swing jack 96 is actuated, swing lever 110 pivots about its fixed end 112 with the opposite end of swing lever 110 traversing an arcuate path that is concave toward the front of swing frame 30. The swinging motion of end 92 of swing lever 110 is imparted through connecting frame 76 to swing frame 30. Simultaneously with impart-ing a swinging motion to connecting frame 76 and swing frame 30, the moving end of swing lever 110 imparts to the lower frame plate 66 of swing frame carriage 32 a straight linear movement parallel to the longitudinal axis of car 12, which straight linear motion is also imparted to the rear end of swing frame 30 at a point immediately above the center of pivot post 74 on swing frame carriage 32. The combination of the swinging motion of swing frame 30 and connecting frame 76 with the linear motion of swing frame 30 and swing frame carriage 32 results in movement of the front end of swing frame 30 along a straight line laterally with relation to drilling machine 10 and perpendicular to the longitudinal axis thereof.

As illustrated in FIGURES 1 and 4 the reciprocating means 116, such as a hydraulic jack, is connected at 118 to rear member 44 of swing frame 30 and is connected at 119 to a boom carriage, indicated generally by reference numeral 120 and illustrated in detail in FIGURES 5 and 6. Boom carriage 120 is illustrated in detail in FIGURES 5 and 6 and includes a base 122, spaced parallel front side walls 124 extending upwardly from base 122 and connected by a front end plate 125 and spaced parallel rear side walls 126 extending upwardly from base 122 and connected by a rear end plate 127 to which the reciprocating means 116 is pivotally connected at 119. A pair of roller connecting plates 128 are rigidly secured one on either side of base 122 between the front side walls 124 and rear side walls 126. A pair of front rollers 130 are rotatably mounted on each roller connecting plate 128 at the side thereof remote from base 122 of boom carriage 120. A rear roller connecting plate 132 is rigidly secured to and spaced from the outer surface of each rear side wall 126 of boom carriage 120, and a rear roller 134 is rotatably secured to each of rear roller mounting plates 132 adjacent the side thereof remote from the rear side wall 126.

FIGURES *3 and 4 illustrate the swing frame 30 and FIGURES 5 and 6 illustrate the boom carriage 120. The boom carriage 120 is maintained in the swing frame and the rear end of boom carriage is connected at 119 to reciprocating means 116, front rollers on boom carriage 120 engage and traverse a path between front side rails 50 and 52 on swing frame 30, and rear rollers 134 on boom carriage 120 engage and traverse a path between side rails 46 and 48 on swing frame 30. As was indicated above, side rails 48 and 50 are removable from side members 42 of swing frame 30 to enable assembly and adjustment of boom carriage 120 on swing frame 30. Reciprocating means 116 can be actuated to move boom carriage 120 longitudinally along swing frame 30, thereby increasing the available drilling area obtainable with the use of this invention and permitting greater flexibility in aligning the drill with the desired location of bolt holes and with predrilled holes in the rigid tunnel support members.

Upper and lower boom rails 136 and 138, respectively, are connected, as shown in FIGURE 6 on boom carriage 120 to the outer surface of rear side wall 126 and extend outwardly therefrom in spaced parallel relation with each other to define therebetween a slide path 140. A plurality of bolt holes 142 extend through rear side wall 126 and boom rails 136 and 138 are connected to rear side wall 126 by bolts 144 through holes 142, or other suitable fastening means constructed and arranged to permit adjustment of the rails to provide a slide path 140 that can be either horizontal or can be inclined at an angle to the horizontal. For example, hole 142 can have a diameter substantially larger than the shaft of bolt 144 which is secured by a lock nut 145, -as shown in FIGURE 5, and a lock washer 146 or other suitable means, can be interposed between the head of bolt 144 and the outer surface of rail 136 or 138 to provide secure rigid mounting of the rails on rear side wall 126 with the rails oriented in any desired horizontal or inclined position. The function, in combination with other structural elements of the apparatus of this invention, of structure providing either a horizontal or inclined slide path 140 is explained more fully below.

FIGURE '5 illustrates one-half of the mounting arrangement for the boom 1:50 in the boom carriage 120. It should be understood, however, both boom arms 148 are similarly secured to the rear of boom carriage 120. The boom 150 has a pair of parallel arms 148 movably mounted in one end thereof between the pairs of boom rails 13 6 and 138 on boom carriage 120. The arms 148 have a pair of holes 152 extending transversely through the rear end thereof with shafts 154 secured to the boom and extending through holes 152 with boom arms 148 rotatable about shafts 154. Boom rollers 156 are rotatably mounted on shafts 154 between boom arms 148 and boom carriage rear side wall 126 in engagement with the re spective boom rails 1-36 and 138 for traversing slide path 140. Drill pct 34 is pivotally connected at 158 at the opposite end of and between boom arms 148 remote from boom carriage 120.

Elevating means, indicated in FIGURE '6 generally by reference numeral 160, constructed and arranged to raise and lower boom 150 is mounted on boom carriage 120 adjacent front side walls 124. Elevating means 160 comprises a hydraulically actuated elevating jack 162 having 8 a piston rod 164 pivotally connected at 165 to lower side wall 124 of boom carriage 120. The jack 162 is pivotally connected to the elevating links by trunnions 166 on opposite sides of the jack cylinder 168.

The pair of elevating links 170 are pivotally connected at 172 to a shaft 173 extending between front side walls 124 of boom carriage 120 for vertical swinging movement of elevating link 170. A recessed portion 174 is cut in elevating links 170 intermediate the ends thereof to engage trunnions 166 extending outwardly from the side of cylinder 168. Elevating link 170 is secured at 174 on trunnion 166 by retaining bar 176. The end of elevating link 170 remote from pivotal connection 172 to shaft 173 is pivotally connected at 17 8 to a shaft extending transversely across boom carriage 120 with each end of shaft 180 rigidly secured to one of the pair of parallel boom arms 148.

At this point it should be noted for clarity that the complete structure of the boom 150 includes a pair of boom arms 148 that are maintained in spaced parallel relation by shaft 180, drill pot 34, and the connection between boom arms 148 and rear side wall 126 of boom carriage 120. Similarly, elevating means 160 includes a pair of elevating levers 170 that are maintained in spaced parallel relation by the intermediate portion of shaft 180, trunnions 166 and cylinder 168, and the intermediate portion of shaft 173. Detailed description of such plurality of structural elements in the apparatus of this invention has been omitted, where possible, to simplify the description presented herein.

A pair of pivot levers 182 (only one of which is shown in FIGURES 5 and 6) are rotatably mounted on shaft 180 between elevating lever 170 and boom 150. The pivot levers 182 each have oppositely projecting lever arms 184 and 186. One end of each connecting rod 200 is pivotally connected at 188 to lever arm 186 of pivot lever 182, and the other end of connecting rod 200 is pivotally connected at 202 to a connecting bracket 204 extending inwardly from front side wall 124 of boom carriage 120. Connecting rod 200 and mounting bracket 204 are constructed and arranged such that pivotal connection 202 is adjacent and vertically spaced from pivotal connection 172 between elevating lever 170 and shaft 173. A second pair of connecting rods 206 are pivotally connected at 207 to the other lever arms 184 of pivot levers 182, and the other ends of connecting rods 206 are pivotally connected at 208 to one end of a drill pot link 210. The other end of drill pot link 210 is rigidly connected to drill pot 34 at 158 in a common connection with the pivotal connection between boom 150 and drill pot 34.

The above described linkage among elevating means 160, boom 150, and drill pot 34 is constructed and arranged such that a first parallelogram is formed by elevating levers 170, lever arms 1 82 between pivotal connections 178 and pivotal connections 188, connecting rods 200, and the vertical distance between pivotal connections 202 and pivotal connections 172. A second parallelogram is formed by lever arms 184 between pivotal connections 178 and pivotal connections 207, connecting rods 206, drill pot links 210, and the portion of boom arms 148 between pivotal connections 158 and pivotal connections 178. The linkage functions in combination with the pivotal and longitudinally movable connection at the rear end of boom arms 148 to shafts 154 to move drill pot 34 along a straight path. As elevating jack 162 is actuated, pivotal connections 178 between elevating links 170 and boom arms 148 transverses an arcuate path that is concave toward the front end of boom 150. The arcuate forward motion employed to raise and lower boom 150 is combined with the longitudinal motion of boom arms 148 on rollers 156 along slide path 140 to provide a resultant straight line motion to the front end of boom 150 and drill pot 34. The straight line of travel of drill steel 38 in drill pot 34 thus lies in a plane perpendicular to the longitudinal axis through slide path 140.

.Thus, if boom guide rails 136 and 138 are adjusted such that the longitudinal axis of slide path 140 is inclined to the horizontal, the motion of drill pot 34 will follow a straight line making an angle with the vertical along a path perpendicular to the longitudinal axis of slide path 140.

connecting bracket 204 secured to boom carriage 120.

The now location of pivotal connection 202 is on one sideof the vertical line projected downwardly from 'pivotal connection 172. The new location 'of .pivotal connection 202 is displaced to an extent that the line between connection 202 and pivotal connection 172 is at an angle :to the vertical equal to the angle at which drill pot 34 will operate when the boom traverses the desired path inclined to the vertical. The adjustability of connection 202 can be attained by making mounting bracket 204 adjustable on front side wall 124 or by providing a plurality of available locations for connection 202 on mounting bracket 204.

The adjustability or tilt of the drill pot to align the .drill in a new angular path either fore or aft may also be attained after the drill steel 38 and drill bit 39 are in the bolt hole. This is accomplished by moving the boom carriage 120 longitudinally in the swing frame to thus move the pivotal connection 202 longitudinally relative to pivotalconnection 172. This movement of carriage 120 on swing frame 30 is accomplished by remotely actuating the reciprocating means 116.

Operation The drilling machine is moved into position with the ,pair of drilling assemblies 29 extending forwardly from the mobile body 12. The drilling assemblies 29 are positioned with the drill steel 38 adjacent the desired line of drilling. The stabjacks 60 are actuated to move the base plates 62 into abutting relation with themine floor and stabilize the swing frame 30. The drilling assemblies 29 are then separately controlled to pivot the boom assemblies 150 and move the drill bit 39 upwardly adjacent the roof. Where minor fore or aft adjustments are required, the reciprocating means 116 may be actuated to move the boom 150 and boom carriage 120 longitudinally on the swing frame 30 while the drill bit 39' is spaced from the roof. The linkage for boom 150 is then actuated to move the drill steel 38 in an upward vertical direction and the motor 36 is actuated to rotate the drill bit. Where desired, a percussive member may also be associated with the drill pot to apply percussive forces to the drill bit as it is rotatably driven by the motor 36. During the drilling operation, that is as the drill steel 38 is advanced upwardly into the roof, minor angular adjustments can be made to the drill steel to minimize or eliminate rubbing of the drill steel against the bore hole.

Assuming, for example, that the drill bit 39 strikes a hard material during initial penetration and is deflected laterally relative to the longitudinal axis of the boom 1 50. Continued penetrationiof thedrill bit would cause the drill steel 38 to rub on a lateral edge of the bolt hole. To eliminate the rubbing the lateral angularity of the drill steel 38 can be adjusted remotely by actuating the individually operable stabjacks .60 to rotate the swing frame 30 about its longitudinal axis as is illustrated in FIGURE 7. The angular deflection of the drill steel 38 is the same as the angular rotation of the swing frame 30 about its longitudinal axis, as for example, the angle A illustrated in FIGURE 7. With this arrangement, the drill steel 38 is deflected laterally until it is alignedwith the angular hole being formed in the mine roof.

If the angular deflection from the vertical is fore or aft relative to the longitudinal axis of the boom 150, the

angularity of the drill steel 38 can be :adjusted by remotely actuating the reciprocating mechanism 116 to .change the fore or aft angularity of the drill steel 38 after the bit has penetrated the roof. Thebitpenetration in the roof holds the front end of the boom in .a fixed position and tore or aft movement of the boom .in the swing carriage changes the relative location of the pivots in elevating means and changes the fore or aft angle of the drill steel 38.

To drill a series of bolt holes along a line transverse to the longitudinal axis of'the drilling machine, the swing frame 30 of the respective drilling assemblies 29is actuated to move the drill pot in the desired line transverse to the longitudinal axis of the .drilling machine. The angular adjustments previously described may be accomplished in any position of the drilling assemblies 29 by the previously described remote actuating means.

It will be apparent that the combination of longitudinal and lateral movement of the drill steel 38 provides rapid and accurate alignment of the drill steel with a desired location over a large area without repositioning the drilling machine.

Each of the drilling assemblies 29 is separately operated from separate control panels 212 mounted on the front of the drilling assemblies 29. Each of the hydraulically actuated elements is connected by a suitable conduit to the pumps 18. In addition, there may be incorporated with the apparatus of this invention the additional improvements described in application Ser. No. 254,544 comprising the hollow drill steel and suitable collecting conduits connected with vacuum pumps 20 and .dust receiver 22 to provide for continuous collection and removal of dust from the drilling area. The adjustment and linkages associated with the swing frame 30 and boom .150 may also be incorporated in a drilling machine having only one drilling assembly.

According to the provisions of the patent statutes, we have explained the principle, preferred construction, and

mode of operation of our invention and have illustrated and described what we now consider to represent its best embodiments. However, we desire to have itunderstood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically illustrated .and described.

We claim:

1. In a mobile drilling machine the combination comprising,

a mobile body having a horizontal deck portion,

a swing frame assembly pivotally secured to said horizontal deck portion,

a boom assembly having a front end portion and a rear end portion, said boom assembly rear end portion pivotally connected to saidswing frame assembly for vertical pivotal movement of said boom assembly front end portion relative to said swing frame assembly,

means to pivot said boom assembly adjacent said rear end portion relative to said swing frame assembly so that said boom assembly front end portion moves in a vertical linear path,

means to pivot said swing frame assembly in a plane parallel to said horizontal deck portion and move said boom assembly front end portion in a linear path transverse to the longitudinal axis of said mobile body,

said swing frame assembly including universal means to permit limited rotation of said swing frame assembly about the longitudinal axis of said swing frame assembly and relative to said horizontal deck portion, and

actuating means connected to said swing frame assembly to rotate said swing frame assembly about the longitudinal axis thereof and relative to said horizontal deck portion to preselected positions wherein said boom front end portion moves in a plane at an angle to a vertical plane and in a plane parallel to the transverse axis of said mobile body.

2. A mobile drilling machine as set forth in claim 1 which includes,

a drill pot pivotally connected to the front end portion of said boom assembly and having a drill member extending upwardly therefrom,

said boom assembly including linkage means to move said drill member in a linear vertical path, and

means to move said boom assembly relative to said swing frame assembly to adjust said linkage means so that said drill member moves in a plane at an angle to the vertical and in a plane parallel to the longitudinal axis of said mobile body as said boom assembly pivots relative to said swing frame assembly. t

3. A mobile drilling machine as set forth in claim 1 in which said swing frame assembly includes,

a swing frame carriage posiitoned on said horizontal deck portion,

a swing frame having a front end portion and a rear end portion, and

universal connecting means connecting said swing frame rear end portion to said swing frame carriage, said universal connecting means operable to permit limited rotation of said swing frame about the longitudinal axis of said swing frame relative to said swing frame carriage to thereby permit said boom front end portion to move in a plane at an angle to a vertical plane and in a plane parallel to the transverse axis of said mobile body.

4. A mobile drilling machine as set forth in claim 1 in which said actuating means includes,

ground engaging jacks connected to the front end of said swing frame and arranged to rotate said swing frame about the longitudinal axis thereof relative to said swing frame carriage so that said boom front end portion moves in a plane at an angle to a vertical plane and in a plane parallel to the transverse axis of said mobile body.

5. A mobile drilling machine as set forth in claim 2 in which said means to move said boom assembly relative to said swing frame assembly includes guide means on said swing frame assembly and power actuated means to move said boom assembly longitudinally relative to said swing frame assembly.

6. -In a mobile drilling machine the combination comprising,

a mobile body having a horizontal deck portion,

longitudinal guide means on said deck portion,

a drilling assembly including a swing frame carriage positioned in said guide means and movable longitudinally along an axis parallel to the longitudinal axis of said mobile body,

' a swing frame having a front end portion and a rear end portion,

universal connecting means connecting said swing frame rear end portion of said swing frame carriage so that said swing frame is operable to pivot in a horizontal plane relative to said horizontal deck portion about said universal connecting means,

a linkage mechanism connected to said deck portion and said swing frame intermediate said end portions, said linkage mechanism including actuator means operable to pivot said swing frame in a horizontal plane and move said swing frame front end portion along a substantially linear path transverse to the longitudinal axis of said mobile body,

support means connected to said swing frame front end portion and arranged to support the front end of said swing frame and to maintain said swing frame transverse axis in a preselected angular relation to a hori zontal plane,

a boom member having a front end portion and a rear end portion, said boom member rear end portion pivotally connected to said swing frame rear end portion for vertical pivotal movement of said boom member front end portion relative to said swing frame,

a drill pot pivotally connected to the front end portion of said boom member and having a drill member extending upwardly therefrom,

said boom member having a second linkage mechanism connected to said drill pot with a second actuator means operable to move said drill member along a linear path in a plane that includes the longitudinal axis of said boom member, and

said support means including means to permit limited rotation of said swing frame about the longitudinal axis of said swing frame and thereby permit the drill member to move in a plane at an angle to a vertical plane and in a plane parallel to the transverse axis of said mobile body.

7. A mobile drilling machine as set forth in claim 6 which includes,

power actuated means connecting said boom member rear end portion to said swing frame,

said power actuated means operable to move said boom member longitudinally relative to said swing frame and move the relative location of the pivot connections in said linkage mechanism to thereby change the angle of said drill member so that said drill member moves in a plane at an angle to the vertical and in a plane parallel to the longitudinal axis of said mobile body.

8. A mobile drilling machine as set forth in claim 6 which includes,

a pair of drilling assemblies arranged in side by side relation on said horizontal deck portions with said boom members extending forwardly therefrom, and

separate linkage mechanisms connected to said deck portion and arranged to pivot the front ends of said drilling assemblies toward and away from each other in a horizontal plane so that said drill members move in the same linear path transverse to the longitudinal axis of said mobile body.

9. A mobile drilling machine as set forth in claim 6 in which said support means includes,

a pair of ground engaging jack members connected to said swing frame front end portion on opposite sides of the longitudinal axis of said swing frame, and

said jack members including power actuated means operable to extend and retract said jack members and thereby rotate said swing frame about the longitudinal axis thereof.

10. A mobile drilling machine as set forth in claim 9 which includes,

control means for said power actuated means operable to extend and retract said jack members and for said power actuated means operable to move said boom member longitudinally relative to said swing frame, and

said control means operable to adjust the angular relation of said drill member relative to said mobile body during the drilling operation to thereby align the drill member in the drill hole.

References Cited UNITED STATES PATENTS ERNEST -R. PURSER, Primary Examiner. 

1. IN A MOBILE DRILLING MACHINE THE COMBINATION COMPRISING, A MOBILE BODY HAVING A HORIZONTAL DECK PORTION, A SWING FRAME ASSEMBLY PIVOTALLY SECURED TO SAID HORIZONTAL DECK PORTION, A BOOM ASSEMBLY HAVING A FRONT END PORTION AND A REAR END PORTION, SAID BOOM ASSEMBLY REAR END PORTION PIVOTALLY CONNECTED TO SAID SWING FRAME ASSEMBLY FOR VERTICAL PIVOTAL MOVEMENT OF SAID BOOM ASSEMBLY FRONT END PORTION RELATIVE TO SAID SWING FRAME ASSEMBLY, MEANS TO PIVOT SAID BOOM ASSEMBLY ADJACENT SAID REAR END PORTION RELATIVE TO SAID SWING FRAME ASSEMBLY SO THAT SAID BOOM ASSEMBLY FRONT END PORTION MOVES IN A VERTICAL LINEAR PATH, MEANS TO PIVOT SAID SWING FRAME ASSEMBLY IN A PLANE PARALLEL TO SAID HORIZONTAL DECK PORTION AND MOVE SAID BOOM ASSEMBLY FRONT END PORTION IN A LINEAR PATH TRANSVERSE TO THE LONGITUDINAL AXIS OF SAID MOBILE BODY, SAID SWING FRAME ASSEMBLY INCLUDING UNIVERSAL MEANS TO PERMIT LIMITED ROTATION OF SAID SWING FRAME ASSEMBLY ABOUT THE LONGITUDINAL AXIS OF SAID SWING FRAME ASSEMBLY AND RELATIVE TO SAID HORIZONTAL DECK PORTION, AND ACTUATING MEANS CONNECTED TO SAID SWING FRAME ASSEMBLY TO ROTATE SAID SWING FRAME ASSEMBLY ABOUT THE LONGITUDINAL AXIS THEREOF AND RELATIVE TO SAID HORIZONTAL DECK PORTION TO PRESELECTED POSITIONS WHEREIN SAID BOOM FRONT END PORTION MOVES IN A PLANE AT AN ANGLE TO A VERTICAL PLANE AND IN A PLANE PARALLEL TO THE TRANSVERSE AXIS OF SAID MOBILE BODY. 